Polishing or like machine



Aug. 10,1926. ,4 1,595,281 W. D. BUSS POLISHING OR LIKE MACHINE FiledJune 15, 1924 2 SheetsSheet Qwuenliop I Au 10 1926. v 15951587 w. D.BUSs POLISHING 0R LIKE MACHINE Filed June 13, 1924 2 Sneets-Sheei 2Patented Aug. 10, 1926.

U mTEn STATES PATENT OFFICE.

WILLIAM D. BUSS, OF CLEVELAND, OHIO, .ASSIGNOR TO THE HAMMONDMANUFACTUR- IN G COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

POLISHING 0R LIKE MACHINE.

Application filed June 13, 1924.. Serial no. 719,777. 7

This invention relates to improvements in polishing and like machinesparticularly of the type embodying an operating motor and one or moreindividually controlled shafts "driven thereby and upon which thepolishing or grinding disks may be removably' mounted; In the presentcase, two aligned separate shafts are shown as having driving connectionwith a continuously running electric motor and separate control meansare provided for starting and stop ping each shaft.

One object of this invention is to provide braking means forpromptlystopping rotation of either shaft whenfreed from its motordrive, so as to prevent idling of the shaft. "This braking means is'operatively connected with the control means for the driving connectionbetween the motor and shaft so that when the driving connection isrendered ineffective the braking means becomes efiective; and when thedriving con nection is effected, the braking action is relieved. V

Another object is to provide means for positively and at will lockingeach shaft against rotation so as to facilitate-the re moval andexchange or renewal of the polishing or grinding disks.

A further object of this invention is to provide one means forcontrolling both the driving connection and the locking means in such amanner that if the driving connection is rendered ineffective thelocking means is advanced toward locking position and locking action canthen readily be effected by slight further movement after the shaft hasbeen brought to rest.

This invention comprises also'the provision of a single actuating orcontrol means for the driving connection, the braking means and thelocking means, all of which therefore operate in harmonious relationwith each other. e

Other objects will appear from the following description and claims whenconsidered with the accompanying drawing.

Fig. 1 shows my improved device in front elevation with part of thecasing broken away and parts in section; Fig. 2 is an end view with partof the casing broken away and other parts in section; Flg. 3 is a detailsectional view taken on line 3-3 ofFig. 2; and Fig. 4 is a similar viewof a modification. 1

Enclosed within the casing 1 is the elec tric motor 2 which is providedon both ends of its rotor shaft with driving pulleys 3 the belts 4 ofwhich extend around the driven pulleys 5 fixed upon the separate shafts6 in the upper part of thecasing. Both ends slip and thereby preventdriving relation be-.

tween themotor and the shaft when desired. This slack may be taken up atwill by means of an idle pulley 10 on an arm 11 rockably mounted in' awall of the casing and controlled by a lever arm 12 on the outside ofthe casing. The belt is shown in slack or idle condition in Fig. 2, butupon movement of the lever arm 12 to the right, pulley l0 tightens thebelt and thereby effects driving relation between the motor and shaft 6.Lever arm 12 may be held in any position to which it is moved by thepawl 13 actuated by lever; 14: and yieldably engaged with the notchedsegment 13 wall.

When pulley 10 is moved away from the belt the shaft 6 will continue torun idly until friction brings it torest. To bring it to rest promptly Ihave provided a brake 15 the resilient lining 16 of which is adapted toengage the drum 15 on shaft 6., Brake 15 is mounted upon the upper endof a rod 17 working in a barrel 18 against compression spring 21 andhaving a guiding pin 19 working in the slot 20 to provide lost motionand prevent relative rotation between rod and barrel. The lower end ofthe barrel 18 has pivotal connection at 23 with the arm 24,0n shaft 25of the army 12. These parts are so constructed and arranged that uponmovement of the lever 12 to the right, Fig. 2, for effecting drivingrelation between the motor and shaft 6 the brake is simultaneouslyrendered ineffective by downward movement of the cylinder 18 which dragsthe rod 17 downwardly therewith by the pin andslot connectiontherebetween.

Lever arm 12 may also be provided with a mounted on the casing 1 lookingor latching pin 26 held by a spring 27 against the side'of segment 1 3which is provided with recess or opening 28 adapted to receive a.manually releasable pin 26 to maintain the lever arm 12 in anypredetermined position. corresponding to the effective position of thebrake. Pin 26 of course may be readily released from its lockingposition by pulling the same outwardly against the tension of the spring27.

Means are also provided for temporarily locking shaft 6 against rotationto maintain it in fixed position while the polishing disks are removedand renewed or eX- changed. The same drum 15 which is engaged by thebrake shoe, is provided with a plurality of radially extending openings29', four being here shown arranged at 90. These openings are adapted toreceive the upper end of a pin 30 which is fixedly secured by a strap 31to the upper end of cylinder 18 and is guided by a bracket 33 on thecasing wall. Pin 30 also extends through a side portion 3 1 of the brakeshoe 15. Upon upward movement of the cylinder 18, the rod 30 is alsomoved upwardly into engagement with one of the openings 29' in themanner and for the purpose now to be explained.

ALE; above stated, the parts as shown in the present illustration are inidle position; that is, driving relation between the motor and shaft 6is broken. The brake is fully applied to the brake drum to bring shaft 6to rest, and pin 30 is in engagement with one of the openings 29 tohold' or look shaft 6 against rotation in either direction. hen thedriving relation is again established be tween the motor and shaft 6,the pulley 10 takes up the belt slack and lever 12 occupies a positionto the right of that illustrated in ldig. 2. Also, the brake shoe isaway from the brake drum and pin 30 is out of engagement with theopening 29. W hen it is desirel to stop operation of the shaft 6 for anypurpose. the lever 12 is moved to the left to bring the pin 26 intoengagement with a recess 28. such movement being sufiicient to permitthe belt to become slack and ineffective and also to move the cylinder18 upwardly. Spring 21 is confined in cylinder 18 with some inherentcompression and. as soon as the upper end of slot 20 leaves the pin 19the full compression effect of spring 21 is applied through the brake tothe brake drum, bringing shaft 6 to rest before the upper end of rod. 30reaches the drum.

Whenever the operator desires to tem- ,porarily lock the shaft againstrotation,

re moves the lever 12 farther to the left, Fig. 2, until thepin 26 snapsinto a second recess 28% such further operation causing stem 30' toenter one of the openings 29 which in the meantime has been brought intoproper registering position by mantially turning the shaft 6'. Afterexchange or renewal of the polishing or grinding disks, the machine maybe set irto operation by withdrawing the pin 26 from the recess 28 andmoving lever 12 to the right to effect the driving relation between themotor and shaft 6'. Simultaneously pin 30 is withdrawn from the opening29 and the brake shoe is relieved from engagement with the drum so thatshaft 6is at once driven. Such manipulation 'of' lever 12 movesv thecylinder 18 downwardly permitting spring 21 to expand and move pin 19 tothe upper end of the slot 20 andposit'ively lowers the brake-shoe awayfrom the brake drum; Lever 12 is then held in its right-handposition bythe pawl 13.

In Fig. 1 I have shown a modified form of locking means for lever 12.Herev I have provided recesses 35 and 35" which are adapted to'receivethe tapered end of a yielding pin 36. The handle 12 is moved to theright or to the left, as they case. may

e, whereupon the tapered nose. of the pin rides up out of the tapereddepression or seat. instead of a separate pin 36 and spring 3'7, thelever arm may itself be formed with an integralprojection and the leverarm may be sufii'ciently resilient that such projection may besnappedinto and out of such depressions: or seats in the same manner asjust now described.

W hat I claim is:

1. In a machine of the class described,

the combination of a rotatable shaft, operative means for said shaft,disconncetible operative connecting means between said operating meansand shaft, brakingmeans for aid shaft, a single control-ling means forsaid connecting means and braking means, and means for holding saidcontrolling means in any adjusted position.

2.1a a machine of the class described, the combination of a rotatableshaft, oper ating means therefor, disconnectible operative connectingmeans between said operaating means and said shaft.v braking means forsaid shaft, controlling means for said connecting means and said brakingmeans, and means for automatically holding said controlling means in anyadjusted position.

3.111 a machine of the class described, the combination of a rotatableshaft, means for remo'vablv securing an attachment to said shaft, meansfor operating said shaft, and means for temporarily locking said shaftagainst rotation in both directions so as to facilitate the connectionor disconnection ofsaid attachment.

1. in a machine of the class described, the combination of a rotatableshaft structure having an opening therein. means for removably securingan attachment to said shaft structure, and means adapted to en thecombination of rotatable shaft, means for removabiy securing anattachment to sa'd shaft, meai s for operating said shaft, means fortemporarily locking said shaft against rotation so as to facilitate theconnection or disconnection of said a tachment, and means for actuatingsaid locking means upon stopping of said shaft and for releasthe sameupon starting of the shaft.

7. In a machine of the class described, the combination of rotatableshaft, means for removably securing an a tachment to said shaft meansfor operating sai-c shaft, controlling means for rendering saidoperating means effective or ineffective, means for temporarily lockingsaid shaft against rotation so as to facilitate the connection ordisconnection of said attachment, and a single means for actuating saidcontrolling means and said locking means.

8. In a. machine of the class described, the combination of a rotatableshaft, means for removably securing an attachment to said shaft, meansfor operating said shaft, controlling means for rendering said operatingmeans effective or ineffective, means for temporarily locking said shaftagainst rotation so as to facilitate the connection or disconnection ofsaid attachment, and means for simultaneously actuating said controllingmeans and said locking means.

9. In a machine of the class described, the combination of a rotatableshaft, disconnectible operating means therefor, braking means for saidshaft, means for removably securing an attachment to said shaft, meansfor temporarily locking said shaft against rotation so as to facilitatethe con nection or disconnection of said attachment, and means forsimultaneously actuating said braking means and said locking means.

10. In a machine of the class described, the combination of a rotatableshaft, means for removably securing an attachment to said shaft, meansfor operating said shaft, controlling means for rendering said operatingmeans effective or ineffective, means for temporarily locking said shaftagainst rotation so as to facilitate the connection or disconnection ofsaid attachment, a braking means for said shaft, and means forsimultaneously actuating said controlling means,

said braking means and said locking means.

11. Ina machine of the class described, the combination of a rotatableshaft, operating means therefor, braking means for said shaft, means forremovably securing an attachment to said shaft, means for temporarilylocking said shaft against rotation so as to facilitate the connectionor disconnection of said attachment, means for actuating said brakingmeans and said locking means, and means for maintaining said actuatingmeans in two positions, in one of which positions said braking means iseffective and said locking means is ineffective, and in the other ofsaid positions said looking means is effective.

12. In a machine of the class described, the combination of a rotatableshaft, operating means therefor, braking means for said shaft, means forremovably securing an attachment to said shaft, means for temporarilylocking said shaft against rotation so as to facilitate the connectionor disconnection of said attachment, a single actuating means for saidbraking means and locking means, and said braking means including ayieldable part, whereby said locking means may be applied afterapplication of said braking means.

13. In a machine of the class described, the combination of a rotatableshaft, operating means therefor, braking means for said shaft, means forremovably securing an attachment to said shaft, means for temporarilylocking said shaft against rotation so as to facilitate the connectionor disconnection of said attachment, said shaft being provided withportions adapted for engagement by said braking means and looking means,respectively, actuating means for effecting engagement of said brakingmeans and locking means with their respective portion, and a yieldableconnection between said braking means and said actuating means, wherebysaid braking means may be applied gradually.

14. In a machine of the class described, the combination of a rotatableshaft, operating means therefor, braking means for said shaft, meansforremovably securing an attachment to said shaft, means for temporarilylocking said shaft against rotation so as to facilitate the connectionor disconnection of said attachment, a single actuating means for saidbraking means and loclc ing means, and spring and pin-and-slotconnectionbetween said braking means and actuating. means.

In testimony whereof I hereby aflix my signature.

WILLIAM 1)., Boss.

